External Trigger/Sample (System Interconnect) Connector; Serial Port Connector - Tektronix 2642A Reference

lntroduction
1-6
The 2642A Analyzer
External Trigger/Sample (System Interconnect) Connector
The external trigger/sample connector on the channel controller board
is a standard 9-pin male connector accessible from the rear of the unit.
The pinouts are shown below.
Pin Meaning
Ex1ernal triggering. A TTL-level signal input to the analyzer.
1
This trigger source is selected in the Instrument Program
TRIGGER menu. The trinner is aenerated at the trailina edae.
2
Trigger sense output.
A
TTL-level signal indicating trigger
detection.
External clock input. A TTL-level signal for inputing a base.
3
undivided sample clock (at 8 Mhz). Used for factory diagnostic
purposes.
6, 7 , 8 Siana! around
Ex1ernal sampling input. A TTL-level signal input to the
9 analyzer at the desired A/D sampling rate. This clock source is
selected in the Instrument Proaram INPUT menu.
Serial Port Connector
The 2642A is equipped with a serial
port
connector that links the
analyzer to the host computer via a Tektronix-supplied serial interface
cable.
You are supplied with two types of serial interface cables:
Host Computer
IBMPCorXT
IBM AT or PS/2
Host Computer Connector
25-pin female (option IB)
9-pin female (option 2B)
The serial interface cable pin assignments are shown in the table on the
next page. Connector pins I, 2, 7, 8, and 9 are not used and should not
be connected.